Chain-stitch sewing-machine.



I. R. MOFFATT.

CHAIN STITCH SEWING MACHINE.

' APPLIGATION FILED JAN. 9, 1911. 1,127,967, Patented F6112, 1915.

2 SHEETSSHEET 1.

WITNESS b v [NVENTOR M .Jitarne /S L. R. MOFFATT. CHAIN STITCH SEWING momma.

APPLIGATION FILED JAN. 9, 1911. 1 12? @5? wPateznficeui Feb. 2, 1915.

2 SHEETS-SHEET 2.

[N VENT 0R A Home specification of Letters latcut.

cnerstsrisou snwmeueonmn pause Feb, 2.. was.

r'ipplicetioutled Jeni: my 9, ion. Serial No. 691,655.

lriorrs'rr, s residing at State or 5 Illinois, have invented. certain new and useful Improvements in Chainfititch Sewing Machines, of which the following is e description, reference being; to the sccom panying' drawing and to the letters and figures of reference marked thereon;

The invention relates to new and useful improvements in. chain stitch machines, and more especially to mechines oi character in which threaded needle coiiperates jwith a non-threed-cerryii'ir, looper to form a series of single chain stitches.

An object of the invention is means for properly supporting the needle loop so as to present the some for the entrance of the needle whereby the loops of thread may be properly interlocked, and all liability of the shipping oi stitches avoided.

In the drawings which show by way of illustration one embodiment 01" the inventionz-Figure l is it view partly in section and with parts broken owoy of the forward end of a sewing machine embodying my improvements. Fig. 2 is s sectional view through the throat e, also sl'lowing the presser foot, needle and the looper, aid the feed at the time the looper is em tering the needle loop. lis e similar view showing the position 01 the when the needle is shout to e: the needle loop,

held bythe looper. Fr 4- .is e top plan view of the throat showing in dotted lines the lcoper needle loop spreader. Fig. 5 is a bottom view of the throat plate.

to provide The sewing machine herein shown, con q & needle, loop and thus cause sists ofe bed plate 1, on which is mounte the usual work support A es/rile her 3 is reciprocated ove arm i by a needle lev a is connec ,d to the bar carries a needle T at t. end thereof. The Dresser her E3 is mounted in the overhanging arm 4 and carries foot 9 which may he 0' 1 e ore "y construction and which dog 10 mounted hone A the WOZ'lx support to reciprocate in the usual manner in this type of machine.

Coiiperuting with the *1 is it near thread-carrying looper ll. which is mount needle slot "on o. looper carrier 12 pivoted toe looper support 13. The looper carrier 12 s vihrated on its pivotal support by the usual link 14. The looper support 13 is. also vibratedon its hearing by a link connection 15 with the end of the main shaft.

The above parts are of the usual construction, and will not need further description in order that the present invention may be understood.

.Thfi needle penetrates the material ond-- as it is retracted, throws out the usual needlc loop which is entered by the looper 11. The looper moves forward to the end of its stroke, andthen laterally so as to position the needle loop held by the looper for the entrance of the needle on the next descent thereof. The looper is not only moved iaterally but is slightly retracted before the point of the needle reaches the needle loop. As the loopcr is retracted, one limblof'the needle loop which is moving with the looper will be brought into contact With s spreading finger 16, which is secured to the under side of the throat plate 17 by a screw 18. This spreader will retain temporarily the. strand of the needle loop which is engaged thereby, and the further retracting movement of the looper causes the needle loop to be spread or positioned in a plane approachinn; 2. horizontal plane so as to open widely the needle loop for the entrance of the needle.

Iheve found in practice that where the needle loop which extends from the looper to the previous needle puncture in the fabric is slightly loosened'by the retracting moveni'ent of the looper that said needle loop is liable to twist and become positioned so that the needle would pass outside of the 95 the machine to skip stitches.

To aid in supporting the needle loop so that the same cannot twist or be improp: crly positioned, l have provided a bar 19 which is locateddirectly underneath the 20 in the throat plate, and extends across the needle slot intermediate the ends thereof." Said bar as herein showxnis attached to the throat plate, althou h it is obvious that any suitable means may e provided for supporting the her substantially in the position. stated;

When the feed of the fabric occurs, the

needle loop extending from the previous 119.

needle puncture around the looper will be brought in contact'with said bar, and will thereby be supported at a point between the looper and the previous needle puncture, where the needle thread is interlocked with the previous needle loop in the chain of stitches. This supporting of the needle loop as above noted, will hold the needle loop with both strands thereof in a plane approaching a horizontal plane, and will also tend to separate the two strands so that the needle will with certainty, enter into said needle loop. This bar which tends to place the loop in a horizontal plane at the base thereof, cooperates with the loop-spreading finger 16 in properly positioning the needle .loop for the entrance of the needle. In orsecure by Letters Patent, is

1; In a sewing machine, the combination of feeding mechanism, a needle, a nonthread-carrying looper, means for supporting said looper whereby the same'may be moved in a direction substantially at right angles to the line of feed, means for oscillatinsane ing said looper into and out of the needle loop, means for moving said looper laterally to position the-needle loop for the entrance of the needle, a bar and means for supporting said bar in a position substantially at right angles to the line of feed and adjacent the path of the needle in rear thereof, whereby the needle loop on the looper is supported by said bar.

2. A throat plate having aneedle'slot formed therein, a loop retainer secured to said throat plate in advance of the needle slot and having a projecting finger for-engaging one strand of the needle loop, and-a bar secured to said throat plate and extending across said needleslot in rear of the portion of said slot entered by said 3. In a sewing machine, the combination needle. I

of a needle, a looper, a throat plate having a needle slot formed therein, a loop retainer secured to said throat plate'in advance of the needle slot and having a projecting fin: gerv for engaging one strand of the needle loop, whereby the same is spread for the 7 entrance of the needle, a bar secured to said throatplate and extending across the needle slot in rear of the portion thereof entered by the needle, whereby the needle loopextending around the looper and engagedby said loop retainer, is supported by said bar.

In testimony whereof I afiix my signature,

I in presence-of two witnesses.

JAMES R. MOFFATT.

Witnesses:

C. M. NEIL, A. B. CLOTHIER. 

